| PostgreSQL 9.5.0 Documentation | |||
|---|---|---|---|
| Prev | Up | Chapter 49. System Catalogs | Next |
The catalog pg_transform stores information about transforms, which are a mechanism to adapt data types to procedural languages. See CREATE TRANSFORM for more information.
Table 49-49. pg_transform Columns
| Name | Type | References | Description |
|---|---|---|---|
| trftype | oid | pg_type.oid | OID of the data type this transform is for |
| trflang | oid | pg_language.oid | OID of the language this transform is for |
| trffromsql | regproc | pg_proc.oid | The OID of the function to use when converting the data type for input to the procedural language (e.g., function parameters). Zero is stored if this operation is not supported. |
| trftosql | regproc | pg_proc.oid | The OID of the function to use when converting output from the procedural language (e.g., return values) to the data type. Zero is stored if this operation is not supported. |